Put top side in trouble? (7)
I believe the answer is:
deposit
'put' is the definition.
(I know that deposit is a type of lay)
'top side in trouble?' is the wordplay.
'top side' becomes 'topside' (synonyms).
'in trouble?' is an anagram indicator (I've seen 'in trouble' mean this).
'topside' anagrammed gives 'DEPOSIT'.
(Other definitions for deposit that I've seen before include "I posted (anag.)" , "Put down or leave something" , "Lodge money in bank account" , "Drop" , "Part payment on a purchase" .)